4xx codes – client error

The 4xx codes or client errors indicate that the request contains bad syntax or cannot be fulfilled in this server. They are described in the following table:

Code

Event name

Reason

400

Bad request

The request couldn't be processed due to syntax error.

401

Unauthorized

The request that was received requires user authentication. Usually the client will ask the user for it.

402

Payment required

This is reserved for future use.

403

Forbidden

The server has understood the request, but is refusing to perform it. The client should not try it again.

404

Not found

The server notifies the client that the user does not exist in the domain specified in the Request URI.

405 ...

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